feat: add base.acosdf to namespace

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---

Author: kgryte

lib/node_modules/@stdlib/namespace/lib/namespace/base/a.js

@@ -140,12 +140,27 @@ ns.push({
 	'type': 'Function',
 	'related': [
 		'@stdlib/math/base/special/acos',
+		'@stdlib/math/base/special/acosdf',
 		'@stdlib/math/base/special/acosh',
 		'@stdlib/math/base/special/asind',
 		'@stdlib/math/base/special/atand'
 	]
 });
 
+ns.push({
+	'alias': 'base.acosdf',
+	'path': '@stdlib/math/base/special/acosdf',
+	'value': require( '@stdlib/math/base/special/acosdf' ),
+	'type': 'Function',
+	'related': [
+		'@stdlib/math/base/special/acosd',
+		'@stdlib/math/base/special/acosf',
+		'@stdlib/math/base/special/acoshf',
+		'@stdlib/math/base/special/asindf',
+		'@stdlib/math/base/special/atandf'
+	]
+});
+
 ns.push({
 	'alias': 'base.acosf',
 	'path': '@stdlib/math/base/special/acosf',